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   "execution_count": 3,
   "id": "5f89458b",
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   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      " Volume in drive D is soft\n",
      " Volume Serial Number is D013-8444\n",
      "\n",
      " Directory of D:\\SourceCode\\ai\n",
      "\n",
      "2021/10/08  11:21    <DIR>          .\n",
      "2021/10/08  11:21    <DIR>          ..\n",
      "2021/10/08  11:04             1,442 .gitignore\n",
      "2021/10/08  11:18    <DIR>          .ipynb_checkpoints\n",
      "2021/10/08  11:21             1,499 hellojupyter.ipynb\n",
      "2021/10/08  11:08                39 re.txt\n",
      "               3 File(s)          2,980 bytes\n",
      "               3 Dir(s)  90,238,967,808 bytes free\n"
     ]
    }
   ],
   "source": [
    "ls"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "id": "e7386310",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "3"
      ]
     },
     "execution_count": 5,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "a=1\n",
    "b=2\n",
    "a+b"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "7c2426b3",
   "metadata": {},
   "source": [
    "# 一级标题\n",
    "## 二级标题\n",
    "### 三级标题"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "5e144ecd",
   "metadata": {},
   "source": [
    "- 缩进\n",
    "    - 二级\n",
    "       - 三级\n",
    "        "
   ]
  }
 ],
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